That is a big question. The short answer is that you need to work with XenForo's templates and CSS to modify the style to your liking. It is a process that requires styling ability (strong html / css).

Most of the HTML you want will probably be in this template:

Admin CP -> Appearance -> Templates -> PAGE_CONTAINER

That is the html skeleton used by all XenForo pages.

CSS is defined throughout the various .css templates in the same area:

Admin CP -> Appearance -> Templates

...but you will probably mostly be adding custom CSS to this template:

That is a big question. The short answer is that you need to work with XenForo's templates and CSS to modify the style to your liking. It is a process that requires styling ability (strong html / css).

Most of the HTML you want will probably be in this template:

Admin CP -> Appearance -> Templates -> PAGE_CONTAINER

That is the html skeleton used by all XenForo pages.

CSS is defined throughout the various .css templates in the same area:

Admin CP -> Appearance -> Templates

...but you will probably mostly be adding custom CSS to this template:

Admin CP -> Appearance -> Templates -> EXTRA.css

Click to expand...

Thanks for you help, I will search for a web deveoper for customize the template.